DTC P0A08-264: DC / DC Converter Status Circuit [12/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   Only P0A08-264 is output, or DTCs other than the ones in the table below are also output.	A
   Any of the following DTCs including pending DTCs are also output.	B

   DTC No.	Relevant Diagnosis
   P0A1B-547	Drive Motor "A" Control Module
   P0A40-549	Drive Motor "A" Position Sensor Circuit Range/Performance
   P0A78-548	Drive Motor "A" Inverter Performance
   P0A93-346	Inverter Cooling System Performance
   P0AA6-526, 613	Hybrid Battery Voltage System Isolation Fault
   P0ADB-227	Hybrid Battery Positive Contactor Control Circuit Low
   P0ADF-229	Hybrid Battery Negative Contactor Control Circuit Low
   P0AE6-225	Hybrid Battery Precharge Contactor Control Circuit Low
   P0C73-776	Motor Electronics Coolant Pump "A" Control Performance
   P3004-131, 803	High Voltage Power Resource
   P314A-828	Inverter Coolant Pump Speed Signal

5. Turn the ignition switch off.

B → See step   22 

A: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect connector 1E from the engine room relay block and junction block assembly.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1E-1 - 1D-1 (AMD)	Always	Below 1 Ω

3. Check the fusible link (DC/DC) in the engine room relay block and junction block assembly for improper installation.

   OK

   The fusible link is installed securely.

4. Connect the 1E connector to the engine room relay block and junction block assembly.

NG → REPLACE FUSIBLE LINK (DC/DC) 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

2. Remove the inverter terminal cover from the inverter with converter assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

3. Remove the inverter cover from the inverter with converter assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

4. Using a megohmmeter set to 500 V, measure the insulation resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NOTE:

   Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   a2-1 (W) - Body ground and shield ground	Ignition switch off	1 MΩ or higher
   a2-2 (U) - Body ground and shield ground	Ignition switch off	1 MΩ or higher
   a2-3 (V) - Body ground and shield ground	Ignition switch off	1 MΩ or higher
   a4-1 (W) - Body ground and shield ground	Ignition switch off	1 MΩ or higher
   a4-2 (U) - Body ground and shield ground	Ignition switch off	1 MΩ or higher
   a4-3 (V) - Body ground and shield ground	Ignition switch off	1 MΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Motor Cable (for MG1)
   *2	Motor Cable (for MG2)

   HINT: 

   Perform this inspection while the motor cable (for MG1) and motor cable (for MG2) are connected.

5. Install the inverter cover.
6. Install the inverter terminal cover.

NG → See step   14 

OK: Go to next step 

1. Connect the cable to the negative (-) auxiliary battery terminal.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   1D-1 (AMD) - Body ground	Ignition switch off	Same as auxiliary battery voltage

3. Disconnect the cable from the negative (-) auxiliary battery terminal.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

2. Check that the bolt for the AMD terminal is tightened to the specified torque, the AMD terminal is connected securely, and there is no contact problem.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Torque

   T=8.0 N*m {82 kgf*cm, 71in.*lbf }

   Result

   Result		Proceed to
   There are no arc marks.	The terminal is connected securely and there is no contact problem.	A
   There are no arc marks.	The terminal is not connected securely and there is a contact problem.	B
   There are arc marks.	-	C

B → CONNECT SECURELY 

C → REPLACE MALFUNCTIONING PARTS 

A: Go to next step 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

2. Disconnect connector A47 from the inverter with converter assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A47-12 (NODD) - Body ground	Ignition switch off	110 to 150 kΩ

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Inverter with Converter Assembly)

4. Connect the inverter with converter assembly connector.

NG → See step   16 

OK: Go to next step 

HINT: 

The current at the AMD terminal cannot be measured directly because of space limitations. Measure the current flowing at the auxiliary battery instead.

1. Connect the AC/DC 400 A probe to the positive auxiliary battery line.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Install the service plug grip.
3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Turn the ignition switch to ON (READY) and leave the vehicle as it is until the electric current flowing into the auxiliary battery becomes 10 A or less.

   HINT: 

   If the ignition switch turns off immediately after it is turned on (READY), auxiliary battery voltage may be low. Recharge the auxiliary battery and perform this procedure again.

5. Measure the current flowing from the auxiliary battery with the ignition switch to ON (READY), the headlight position switch and blower motor switch in the HI position, and the rear window defogger turned on.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Current

   Item	Condition	Specified Condition
   Current flowing from auxiliary battery	Ignition switch ON (READY) (The headlight position switch and blower motor switch are in the HI position, and the rear window defogger is turned on.)	0 A or less (no current from auxiliary battery)

6. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Item	Condition	Specified Condition
   Auxiliary battery voltage	Ignition switch ON (READY) (The headlight position switch and blower motor switch are in the HI position, and the rear window defogger is turned on.)	13 to 15 V

7. Turn the ignition switch off.

NG → See step   25 

OK: Go to next step 

B → ADD HV COOLANT 

C → INSPECT FOR HV COOLANT LEAK AND ADD HV COOLANT 

A: Go to next step 

NG → CORRECT THE PROBLEM 

OK: Go to next step 

NG → See step   26 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Read the freeze frame data Ambient Temperature using the Techstream.
5. Check if the freeze frame data Ambient Temperature is below freezing.

   Result

   Result	Proceed to
   Ambient Temperature value is above freezing temperature of the HV coolant.	A
   Ambient Temperature value is below freezing temperature of the HV coolant.	B

   HINT: 

   • HV coolant (SLLC) with a 30% concentration freezes at -15 °C (5°F) and HV coolant (SLLC) with a 50% concentration freezes at -35°C (-31°F).
   • If the HV coolant freezes in the HV radiator or HV water pump, the coolant temperature in the inverter with converter assembly rises because the HV coolant cannot circulate. As a result, a DTC may be set.
   • A DTC is set when the water pump impeller cannot rotate due to freezing of the HV coolant.
   • If a DTC is set due to freezing of HV coolant, the problem cannot be reproduced. Judge whether freezing of HV coolant occurred according to the freeze point of the HV coolant, HV coolant change history and ambient temperature when the DTC was set.
6. Turn the ignition switch off.

B → See step   17 

A → See step   25 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

2. Remove the inverter terminal cover from the inverter with converter assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

3. Remove the inverter cover from the inverter with converter assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

4. Disconnect the motor cable (for MG1) from the inverter with converter assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

5. Using a megohmmeter set to 500 V, measure the insulation resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NOTE:

   Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   a2-1 (W) - Body ground and shield ground	Ignition switch off	100 MΩ or higher
   a2-2 (U) - Body ground and shield ground	Ignition switch off	100 MΩ or higher
   a2-3 (V) - Body ground and shield ground	Ignition switch off	100 MΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Shield Ground
   *a	Motor Cable (for MG1) (Inverter with Converter Assembly Side)

6. Connect the motor cable (for MG1).
7. Install the inverter cover.
8. Install the inverter terminal cover.

NG → See step   18 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

2. Remove the inverter terminal cover from the inverter with converter assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

3. Disconnect the motor cable (for MG2) from the inverter with converter assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

4. Using a megohmmeter set to 500 V, measure the insulation resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NOTE:

   Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   a4-1 (W) - Body ground and shield ground	Ignition switch off	100 MΩ or higher
   a4-2 (U) - Body ground and shield ground	Ignition switch off	100 MΩ or higher
   a4-3 (V) - Body ground and shield ground	Ignition switch off	100 MΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Shield Ground
   *a	Motor Cable (for MG2) (Inverter with Converter Assembly Side)

5. Connect the motor cable (for MG2).
6. Install the inverter terminal cover.

NG → See step   20 

OK → See step   25 

1. Disconnect all the connectors from the hybrid vehicle control ECU.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A38-25 (NODD) - G57-6 (E1)	Ignition switch off	110 to 150 kΩ

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Hybrid Vehicle Control ECU)

3. Connect the hybrid vehicle control ECU connectors.

NG → See step   24 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

NEXT → COMPLETED 

B → REPLACE MALFUNCTIONING PARTS 

C → CONNECT SECURELY 

A: Go to next step 

NG → See step   27 

OK → See step   23 

B → REPLACE MALFUNCTIONING PARTS 

C → CONNECT SECURELY 

A: Go to next step 

NG → See step   27 

OK → See step   23